公开(公告)号：EP2381439A4

公开(公告)日：2016-06-29

申请号：EP10733364

申请日：2010-01-21

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN ,  CHONG KOK SENG

IPC: G10L19/008 ,  H04S1/00

CPC classification number: G10L19/008

Abstract: Disclosed is a stereo acoustic signal encoding apparatus in which the signal quality does not deteriorate if there are a plurality of sound sources. A peak tracing unit (401) splits frames of a right channel signal and a left channel signal into a plurality of sub frames; detects the peaks of wave shapes of the split sub frames; and estimates a frame delay time D for each frame of the right channel signal and the left channel signal by comparing the positions of the detected peaks. A time adjusting unit (402) adjusts the time of the right channel signal on the basis of the frame time delay D. A down-mix operation is carried out using the right channel signal which has been subjected to the time adjustment and the left channel signal to generate a mono signal and a sub signal. A mono signal encoding unit (403) encodes the mono signal. A sub signal encoding unit (404) encodes the sub signal. The time delay encoding unit (405) encodes the frame time delay D.

公开(公告)号：EP3010018A4

公开(公告)日：2016-06-15

申请号：EP14811296

申请日：2014-06-10

Applicant: PANASONIC IP CORP AMERICA

Inventor： NAGISETTY SRIKANTH ,  LIU ZONGXIAN

IPC: G10L21/0388 ,  G10L19/02 ,  G10L19/035

CPC classification number: G10L19/0204 ,  G10L19/035 ,  G10L19/167 ,  G10L19/24 ,  G10L21/038 ,  G10L25/18

Abstract: The purpose of the present invention is to more efficiently extend, using a low bit rate, the bandwidth of input signals having a harmonics structure, in order to obtain better audio quality. The present invention is installed in a device that extends bandwidth for audio signal encoding and decoding. This novel bandwidth extension encoding identifies a low-frequency spectrum component having the highest correlation to a high-frequency bandwidth signal among input signals, duplicates a high-frequency spectrum by energy adjustment of said component, and maintains the harmonic relationship between the low-frequency spectrum and the duplicated high-frequency spectrum by adjusting the spectral peak position of the duplicated high-frequency spectrum, on the basis of a harmonic frequency estimated from a composite low-frequency spectrum.

公开(公告)号：EP2814028A4

公开(公告)日：2015-05-06

申请号：EP13747107

申请日：2013-02-01

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN ,  NAGISETTY SRIKANTH ,  OSHIKIRI MASAHIRO

IPC: G10L19/02 ,  H03M7/30

CPC classification number: G10L19/038 ,  G10L19/12 ,  G10L19/16

公开(公告)号：EP2525355A4

公开(公告)日：2016-11-02

申请号：EP11732797

申请日：2011-01-13

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN

IPC: G10L19/02 ,  G10L19/12 ,  G10L19/24

CPC classification number: G10L19/0212 ,  G10L19/12 ,  G10L19/24

Abstract: An audio encoding apparatus that allows a decoded signal exhibiting an excellent sound quality to be obtained on a decoding side. In the audio encoding apparatus (1000A), a time-frequency transform unit (1001) uses a time-frequency transform, such as a discrete Fourier transform (DFT) or a modified discrete cosine transform (MDCT), to transform a time domain signal (S(n)) to a frequency domain signal (spectrum factor) (S(f)). A psychoacoustic model analyzing unit (1002) performs a psychoacoustic model analysis of the frequency domain signal (S(f)), thereby obtaining a masking curve. An acoustic sense weighting unit (1003) estimates, based on the masking curve, an importance degree of acoustic sense, and determines and applies the weighting factors of respective spectrum factors to the respective spectrum factors. An encoding unit (1004) encodes the frequency domain signal (S(f)) as weighted in terms of the acoustic sense. A multiplexing unit (1005) multiplexes and transmits the encoded parameters.

Abstract translation: 一种音频编码装置，其能够在解码侧获得表现出优良音质的解码信号。 在音频编码装置（1000A）中，时间 - 频率变换部（1001）使用离散付里叶变换（DFT）或修正离散余弦变换（MDCT）等时间频率变换来变换时域信号 （S（n））到频域信号（频谱因子）（S（f））。 心理声学模型分析单元（1002）对频域信号（S（f））进行心理声学模型分析，从而得到掩蔽曲线。 声学检测加权单元（1003）基于掩蔽曲线估计声学感觉的重要程度，并且确定并应用各个频谱因子的加权因子到各个频谱因子。 编码单元（1004）根据声学感觉对加权的频域信号（S（f））进行编码。 复用单元（1005）复用并发送编码参数。

公开(公告)号：EP2933799A4

公开(公告)日：2016-01-13

申请号：EP13862073

申请日：2013-11-26

Applicant: PANASONIC IP CORP AMERICA

Inventor： LIU ZONGXIAN ,  NAGISETTY SRIKANTH ,  OSHIKIRI MASAHIRO

IPC: G10L19/035 ,  G10L19/02

CPC classification number: G10L19/0204 ,  G10L19/035